Now you can enjoy the classic Super Mario Bros. game in 3D — allowing players to “defeat enemies as Mario in a whole new way with 3D views and 3D graphics”. Download here (bottom of page).
You can jump by pressing (And holding to jump higher) the up arrow key. You can change the view by moving the camera to see Mario at a different angle. You may do this by pressing W,A,S,and D
[via Make – Destructoid]